litespeedtech/lsquic

Health v2 · maintenance only

Adoption not part of the score

1866 stars · 393 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

LSQUIC is an open-source C library implementing the QUIC transport protocol and HTTP/3 for both servers and clients, used in production by LiteSpeed web server products. It supports QUIC v1/v2, RFC 9000-9002, RFC 9114 (HTTP/3), QPACK, and extensions like WebTransport and unreliable datagrams.

Use cases

• add HTTP/3 support to a C or C++ server
• build a custom QUIC client in C
• implement WebTransport over HTTP/3
• test QUIC protocol compliance and interoperability
• embed QUIC transport in an existing network application
• serve HTTP/3 with QPACK compression

When to choose

• you need a mature, production-proven QUIC/HTTP-3 implementation in C
• you want broad RFC coverage including QUIC v2 and WebTransport
• you are building a high-performance server or client on Linux, macOS, Windows, or FreeBSD

When to avoid

• you want a higher-level language binding rather than a C API
• you prefer a pure userspace Rust or Go QUIC stack for memory safety
• you only need HTTP/2 or TCP-based transport

Facets

library · maturity active

http-server http-client networking security networking web-development developer-tools performance windows bsd cpp c quic http3 tls13 udp-transport webtransport rfc-compliance c-library linux macos

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